The present work has as main objective to analyze the set of questions of the Summa theologiae that concern the treatment of prudence, relying on other Aquinas’ texts when needed. Our specific objective is to develop an investigation that involves the moral philosophy of Aquinas and, therefore, it will be necessary to understand the role of the human soul and its actions. The notion of habit and consequently the notion of virtue and its distinctions will run through our work in order to dwell particularly on the virtue of prudence considered in itself and its parts. Our working line will be to understand the role of prudence in the moral action of the agent according to Aquinas, and how such virtue benefits a certain action having the necessary means for the fulfillment of moral good in consonance with other cardinal and intellectual virtues.